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Salts

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Salts. Salt Solutions. The salts of weak acids can recombine with water producing basic solutions. Salt Solutions. The salts of weak bases can recombine with water producing acidic solutions. Salt Solutions. A - + H 2 O HA + OH - B + + H 2 O H + + BOH.

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Salts

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  1. Salts

  2. Salt Solutions • The salts of weak acids can recombine with water producing basic solutions

  3. Salt Solutions • The salts of weak bases can recombine with water producing acidic solutions

  4. Salt Solutions • A- + H2O HA + OH- • B+ + H2O H+ + BOH

  5. Salt or Hydrolysis Problems

  6. Salt Problem • Calculate the pH of a 0.20 M solution of NaBz • Ka = 6.4 x 10-5

  7. Salt Problem • Calculate the pH of a 0.10 M solution of R-NH3Cl • Kb = 2.5 x 10-5

  8. Salt Applications • Salts of strong acids & weak bases make acidic solutions

  9. Salt Applications • Salts of strong bases & weak acids make basic solutions

  10. Salt Applications • Salts of strong acids & strong bases make neutral solutions

  11. Predict Relative pH • NaAc BaCl2 • KNO3 NH4Br • KHSO4 NH4Ac

  12. Predict Relative pH • KAc NaCl • KClO2 NH4Cl • K2SO4 NaI

  13. Anhydrides • Compounds without water; that when added to water, form other compounds

  14. Acid Anhydrides • Non-metal oxides that form acids when added to water

  15. Basic Anhydrides • Metal oxides that form bases when added to water

  16. Predict Relative pH • Na2O SO2 • NO2 CO2 • CaO Al2O3

  17. Buffer & Salt Hydrolysis Problems

  18. Calculate the pH of 1.0 M HF in 0.50 M NaF. Ka HF = 6.5 x 10-4

  19. Calculate the pH of 5.0 M KCN. KaHCN= 5.0 x 10-10

  20. Calculate [H3PO4], [H2PO4-1], [HPO4-2], [PO4-3], [K+], [H+], & pH of 1.0 M KH2PO4 in 0.50 M K2HPO4. Ka1 = 7.5 x 10-3Ka2 = 6.2 x 10-8Ka3 = 4.2 x 10-13

  21. Calculate pH of: 0.50 M MOHin 0.20 M MCl Kb = 5.0 x 10-5

  22. Calculate pH of: 0.20 M MCl Kb = 5.0 x 10-5

  23. Review of Acid/Base descriptions and Acid/Base, Buffer, & Salt Equilibria

  24. Arhenius, Bronsted-Lowry, & Lewis Acids & Bases

  25. Strong Acids Strong Bases

  26. Acid rxns Base rxns

  27. A/B Equilibrium Constants KW, KA, KB, & pH

  28. Calculate pH of: • 0.025 M HNO3 • 0.020 M KOH

  29. Calculate pH of: • 2.0 M HNO2 • Ka = 2.0 x 10-4

  30. Calculate pH of: • 3.0 M HZin • 2.0 M KZ • Ka HZ = 3.0 x 10-5

  31. Calculate pH of: • 0.20 M KQ • Ka HQ = 2.0 x 10-5

  32. 150 mL of 0.10 M KOH was added to 100.0 mL of 0.10 M H2CO3. Calculate [H2CO3], [HCO3-], [CO3-2], [H+], [OH-], & pH of the solution.Ka1 = 4.4 x 10-7Ka2 = 4.7 x 10-11

  33. Calculate [H3A], [H2A-1], [HA-2], [A-3], [K+], [H+],[OH-], & pH of 2.0 M KH2A. Ka1 = 4.0 x 10-3Ka2 = 5.0 x 10-8Ka3 = 2.5 x 10-13

  34. Calculate pH of: • 2.0 M HQ • Ka = 2.0 x 10-6

  35. Calculate pH of: • 6.0 M HZin • 4.0 M KZ • Ka HZ = 3.0 x 10-5

  36. Calculate pH of: • 0.20 M KQ • Ka HQ = 2.0 x 10-7

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